W9FF

ONE-PIECE FLANGED FLUSH FACE DIAPHRAGM SEAL

Reotemp’s W9FF flanged flush-face seal is a one-piece, all-welded assembly. The diaphragm is integral with the flange, giving a crevice-free surface that keeps process flow sweeping across to prevent solids buildup. It is the most economical choice for 316 SS service, and can also be supplied in solid Hastelloy, Monel, Alloy 20, and other exotic alloys when enhanced corrosion resistance is required.

One-piece Seal Design Bolts Directly to Process Flange
Center or Side Instrument Exit
Commonly Supplied with Flush/Calibration Ring
Ideal for Gauge or Differential Pressure Transmitters

Specifications

Wetted Materials

Flange: 316 SS, 304 SS, Monel, Alloy 20, or Hast C-276.
Diaphragm: Identical to Flange Material

Process Temperature Limits

-150° to 850°F

Ambient Temperature Limits

Determined by the Pressure Instrument

Minimum Recommended Span

Diaphragm Size	1.3″	1.9″	2.2″	3.5″	4.1″
2.5″ & 3.5″ Gauges	N/A	30 psi	15 psi	10 psi	30″ H2O
4″, 4.5″, & 6″ Gauges	N/A	60 psi	30 psi	10 psi	30″ H2O
Transmitter (Gauge Pressure)	50 psi	15 psi	150” H2O	30” H2O	15″ H2O
Transmitter (Differential Pressure)	20 psi	200” H2O	100” H2O	30” H2O	15″ H2O
Differential Pressure Gauge	N/A	N/A	N/A	N/A	100” H2O

Available Diaphragm Sizes

Diaphragm Size	1.3″	1.9″	2.2″	3.5″	4.1″
1″ Flange	STD	N/A	N/A	N/A	N/A
1.5″ Flange	N/A	STD	N/A	N/A	N/A
2″ Flange	N/A	-D6	STD	N/A	N/A
3″ Flange	N/A	-D6	-D5	STD	N/A
4″ Flange	N/A	-D6	-D5	-D9	STD
6″ Flange	N/A	-D6	-D5	-D9	STD

Weights and Dimensions

	Flange Rating	A	B	# of Bolts	Weight (lbs.)
1″	150#	4.25″	.56″	4	2
1 ½”		5”	.69”	4	4
2”		6”	.75”	4	5
3”		7.5”	.94”	4	9
4”		9”	.94”	8	17
1″	300#	4.88″	.69″	4	4
1 ½”		6.13”	.81”	4	7
2”		6.5”	.88”	8	8
3”		8.25”	1.13”	8	16

Maximum Working Pressures at 100ºF:
Determined by ANSI B16.5 flange ratings.

NOTE: Weights and dimensions is for raised face flange only. Other flange sizes and sealing face info can be found in ANSI B16.5 standards.

W9FF One-piece Flanged Flush Face Diaphragm Seal